88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file parasiteBuffer.h
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* @author drose
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* @date 2004-02-27
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*/
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#ifndef PARASITEBUFFER_H
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#define PARASITEBUFFER_H
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#include "pandabase.h"
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#include "graphicsOutput.h"
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#include "texture.h"
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#include "pointerTo.h"
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/**
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* This is a special GraphicsOutput type that acts a lot like a
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* GraphicsBuffer, effectively allowing rendering to an offscreen buffer,
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* except it does not create any framebuffer space for itself. Instead, it
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* renders into the framebuffer owned by some other GraphicsOutput.
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*
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* The x_size and y_size must therefore fit within the bounds of the source
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* GraphicsOutput.
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*
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* Since the framebuffer will be subsequently cleared when the actual owner
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* draws in it later, this only makes sense if we are going to copy the
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* contents of the framebuffer to a texture immediately after we draw it.
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* Thus, has_texture() is implicitly true for a ParasiteBuffer.
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*
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* This class is useful to render offscreen to a texture while preventing the
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* waste of framebuffer memory for API's that are unable to render directly
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* into a texture (and must render into a separate framebuffer first and then
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* copy to texture). It is also the only way to render to a texture on API's
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* that do not support offscreen rendering.
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*/
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class EXPCL_PANDA_DISPLAY ParasiteBuffer : public GraphicsOutput {
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public:
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ParasiteBuffer(GraphicsOutput *host, const std::string &name,
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int x_size, int y_size, int flags);
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PUBLISHED:
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virtual ~ParasiteBuffer();
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virtual bool is_active() const;
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void set_size(int x, int y);
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public:
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void set_size_and_recalc(int x, int y);
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virtual bool flip_ready() const;
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virtual void begin_flip();
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virtual void ready_flip();
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virtual void end_flip();
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virtual bool begin_frame(FrameMode mode, Thread *current_thread);
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virtual void end_frame(FrameMode mode, Thread *current_thread);
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virtual GraphicsOutput *get_host();
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private:
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int _creation_flags;
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public:
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static TypeHandle get_class_type() {
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return _type_handle;
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}
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static void init_type() {
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GraphicsOutput::init_type();
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register_type(_type_handle, "ParasiteBuffer",
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GraphicsOutput::get_class_type());
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}
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virtual TypeHandle get_type() const {
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return get_class_type();
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}
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virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
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private:
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static TypeHandle _type_handle;
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};
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#include "parasiteBuffer.I"
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#endif
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